stevenson



(No Model.) v 2 Sheets-Sheet 1.

W. G. STEVBNSON. GRINDING PAN.

No. 462,336. Patented Novy3., 1891.

@No Modem 2 Sheets-Sheet 2.

W. G. STBVBNSON.

GRINDING PAN.

@HT bof/magi l @wijk/mame@ UNITED STATES PATENT OFFICE.

IVIIILIAM G. S'EVENSON, OF lVELLSVILLE, OHIO, ASSIGNOR TO STEVEN SON &COMPANY, OF SAME PLACE.

GRlNDlNG-PAN.

SPECIFICATION forming part of Letters Patent No. 462,336, dated November3, 1891.

Application led May 19, 1891.

T0 @ZZ whom it may concern:

Beit known that I, WILLIAM G. STEVEN- SON, of Wellsville, in the countyof Columbiana and State of Ohio,haveinvented anew and useful Improvementin GrindingPans, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, 'in which-V Figure l is a side elevation,partly in section, of my improved grinding-pan. Fig. 2 is across-section on the line II II of Fig. l. Fig. 3 is a similarcross-section showing a modification.

My invention relates to the construction of grinding machinery in whichheavy rollers are employed, and is designed to prevent vibration andstraining of the frame Work, and also to make the machine stronger andless liable to breakage, which often necessitates troublesome delays forthe purpose of repairs.

The frame-work of my machine consists of the end uprights 2 2,crosspieces 3 3, connecting the upper portions of the uprights, andbeams 4 4, running longitudinally and bolted to the cross-pieces. Theselongitudinal beams are three in number, and from the outer pair dependthe hangers 5, which bend downwardly and inwardly to support at their tlowest portion sliding bearings G, and are extended laterally at suchpoint to surround and form a vertical bearing for the pan-shaft 7. Thisshaft 7 is supported in a step S be-V low the pan, passes upward througha collar on the middle beam a and is provided at its upper end with abevel gear-wheel, by which motion is transmitted to the pan 9. This panis supported upon and rigidly secured to an annular ring lO, whichsurrounds and is integral with the shaft 7, and therefore rotates withthe shaft 7. Upon the inner surface of the pan rests the rolls ll,having shafts 12, which enter the sliding bearings 6 and 13, whichbearings are bolted respectively to the hangers 5 and the uprights 2. Ineach of the bearings G and 13 a bearing-block ll slides in guideways l5,and is supported upon a spring 16, the tension of which may be regulatedby Serial No, 393,298. (No model.)

means of an adjusting-screw 17, bearing upon 5o its lower end, all asshown in Fig. 2.

In Fig. 3 I show a modification in which the hangers 5, instead ofresting upon the outer beams, are each bent upwardly near the center andare supported on opposite sides of the middle beam 4.

The operation is as follows: Power being transmitted to the shaft 7 bymeans of the bevel gear-wheel the pan is rotated, and the rolls, bytheir frictional contact with said 6o y pan, are also revolved. The oreorother Inaterial being fed into the pan is crushed by the heavy rolls,and whenever either roll passes over a large clod or lump the slidingbearings allow the same to risc and pass over the clod, thus preventingthe straining of the frame, which would necessarily arise where a singleshaft carried both rolls.

rlhe advantages of 'my construction lie in the great strength whichresults from the 7o peculiar shape and position ot' the hangers andinthe absence of any binding in the bearings, which would tend to crackand destroy the same. This freedom from binding results from theindependence of motion of the rolls, which are supported on separateshafts.

Many changes will suggest themselves to those skilled in the art, and Itherefore do not Wish to limit myself to the exact construc- 8o tionshown; but

That I claim is# l. A frame-work for pan-Crushers, comprising endsupports, longitudinal beams connecting said supports, and hangersdepending from the connecting-beams and bent inwardly to surround andform a bearing for the panshaft, substantially as and for the purposesdescribed.

2. A grinding-machine comprisinga rotary 9o pan, rolls rest-ing uponsaid pan, a separate shaft foreach roll, sliding bearings at each end ofthe roll-shafts, and springs supporting said bearings, substantially asand for the purposes described.

3. Agrinding-mill comprising uprights, longitudinal beams connectingsaid upright-s, hangers depending from said beams and ex# tendinginwardly to a bearing, a shaft pass- In testimony whereof I havehereunto sei'I ing through said bearing and provided With my hand this16th day of May, A. D. 1891. a pan, sliding bearings mounted on theframe T 1 `1 uprights and upon the hangers, and rolls V` ILLAM G'bTBVENSON' resting upon the pan and having separate Witnesses: shaftsentering said sliding bearings, sub- P. M. SMITH,

stantiaily as and for the purposes described. W. E. SMITH.

